$sql = "SELECT conversation_to_user.participantID AS userID, conversation_to_user.hideConversation, user_table.username
FROM wcf" . WCF_N . "_conversation_to_user conversation_to_user
LEFT JOIN wcf" . WCF_N . "_user user_table
- ON (user_table.userID = conversation_to_user.participantID)
+ ON user_table.userID = conversation_to_user.participantID
WHERE conversation_to_user.conversationID = ?
AND conversation_to_user.participantID <> ?
AND conversation_to_user.isInvisible = ?